COMPARING EFFECTS OF SOIL AND FOLIAR APPLICATION OF POTASSIUM ON BALADY MANDARIN TREES | ||||
| Fayoum Journal of Agricultural Research and Development | ||||
| Article 12, Volume 25, Issue 2, July 2011, Page 128-135 PDF (422.9 K) | ||||
| Document Type: Research articles. | ||||
| DOI: 10.21608/fjard.2011.195509 | ||||
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| Authors | ||||
| Ensherah A. H. Tayeh1; Khaled, A. Shaban2 | ||||
| 1Hort. Instit; Agric. Res. Centre, Giza, Egypt | ||||
| 2Soil, Water and Environment Res. Instit; Agric. Res. Centre, Giza, Egypt | ||||
| Abstract | ||||
| The experiment was conducted during three successive seasons from 2007 to 2009 on twenty five years old Balady mandarin trees budded on sour orange rootstock at 5x5 meter apart, planted in an orchard located at private orchard at El-Kalubia Governorate. The trees was in (ON)year at the first season (2007), to investigate the effects of soil and foliar application of potassium on leaf (NPK), yield and some fruit physical properties (weight, volume, diameter, length, peel thickness, peel weight and some fruit chemical properties( T.S.S.%, total acidity%, T.S.S./ acid ratio, Reducing sugar, total sugar% and Ascorbic acid. The experiment was divided into two parts, the first part was as soil addition and included four treatments (0 – 200 – 400- 800) gm potassium sulphate 48%K2Oper tree. The amount of potassium was divided into two equal batches the first dose added to the soil at mid March and the second added at August. The second part of the experiment was the foliar addition which included three treatments (0- 150 and 300) ppm potassium sulphate, sprayed three times in mid March, May and July. All chosen trees received the usual dose of potassium which used in the orchard studied. Results revealed that all treatments led to increase leaf N and K contents. Increasing the rate of potassium was most effective to increasing leaf N&K, yield per tree and improved both fruit physical properties (fruit weight and volume, diameter length, peel weight and juice percent) and fruit chemical studied properties (T.S.S.%, T.S.S./acid ratio, reducing sugar %, total sugar% and Ascorbic acid). While, leaf P was decreased. Concerning peel thickness, no trend was detected in the three seasons. So, the highest potassium rate had the highest values in all studied parameters except leaf P content, peel thickness and acidity. The main observation was about, K foliar application was most effective in increasing yield and improving fruit quality than soil addition. | ||||
| Keywords | ||||
| Potassium; Balady mandarin | ||||
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